what is vitamin b12 injection given for Injections: You Need To Know B12 Injections - East Valley
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Other MR approaches revealed similar estimates in the sensitivity analyses (Supplementary Figure S1), except for negative association with GGT through robust adjusted profile score method (Beta, 0.69

In fact, people who have B12 deficiency are at higher risk of megaloblastic anemia, which essentially means the body does not have the ability to make enough red blood cells to carry oxygen through the body and leads to chronic fatigue
doi: 10.1097/MCO.0b013e32832cdaae

Bodily introduction of any sort is strictly prohibited by law

All B vitamins help the body to convert food (carbohydrates) into fuel (glucose), which is used to produce energy